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IBM Tivoli Storage Manager for UNIX and Linux Backup-Archive ...

IBM Tivoli Storage Manager for UNIX and Linux Backup-Archive ...

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Controlling symbolic link <strong>and</strong> alias processing<strong>Tivoli</strong> <strong>Storage</strong> <strong>Manager</strong> treats symbolic links <strong>and</strong> aliases (aliases apply to Mac OSX only) as actual files <strong>and</strong> backs them up. However, the file referenced by thesymbolic link is not backed up. In some cases symbolic links <strong>and</strong> aliases can beeasily recreated <strong>and</strong> need not be backed up. In addition, backing up these symboliclinks or aliases can increase backup processing time <strong>and</strong> occupy a substantialamount of space on the <strong>Tivoli</strong> <strong>Storage</strong> <strong>Manager</strong> server.You can use the exclude.attribute.symlink option to exclude a file or a group offiles that are symbolic links or aliases from backup processing. If necessary, youcan use the include.attribute.symlink option to include symbolic links or aliaseswithin broad group of excluded files <strong>for</strong> backup processing. For example, toexclude all symbolic links or aliases from backup processing, except those thatexist under the /home/spike directory, enter these statements in your dsm.sys file:exclude.attribute.symlink /.../*include.attribute.symlink /home/spike/.../*Related reference“Exclude options” on page 312Use the exclude options to exclude objects from backup, image, or archive services.Compression, encryption, <strong>and</strong> adaptive subfile backupprocessingThis topic lists some items to consider if you want to include specific files orgroups of files <strong>for</strong> compression <strong>and</strong> encryption processing during a backup orarchive operation.vvYou must set the compression option to yes to enable compression processing. Ifyou do not specify the compression option or you set the compression option tono, <strong>Tivoli</strong> <strong>Storage</strong> <strong>Manager</strong> does not per<strong>for</strong>m compression processing.<strong>Tivoli</strong> <strong>Storage</strong> <strong>Manager</strong> processes exclude.fs, exclude.dir, <strong>and</strong> otherinclude-exclude statements first. <strong>Tivoli</strong> <strong>Storage</strong> <strong>Manager</strong> then considers anyinclude.compression <strong>and</strong> include.encrypt statements. For example, consider thefollowing include-exclude list:exclude /home/jones/proj1/file.txtinclude.compression /home/jones/proj1/file.txtinclude.encrypt /home/jones/proj1/file.txt<strong>Tivoli</strong> <strong>Storage</strong> <strong>Manager</strong> examines the exclude /home/jones/proj1/file.txtstatement first <strong>and</strong> determines that /home/jones/proj1/file.txt is excludedfrom backup processing <strong>and</strong> is, there<strong>for</strong>e, not a c<strong>and</strong>idate <strong>for</strong> compression <strong>and</strong>encryption processing.v Include-exclude compression <strong>and</strong> encryption processing is valid <strong>for</strong> backup <strong>and</strong>archive processing only.Related reference“Compression” on page 283The compression option compresses files be<strong>for</strong>e you send them to the server.Compressing your files reduces data storage <strong>for</strong> backup versions <strong>and</strong> archivecopies of your files. It can, however, affect <strong>Tivoli</strong> <strong>Storage</strong> <strong>Manager</strong> throughput. Afast processor on a slow network connection benefits from compression, but a slowprocessor on a fast network connection does not.Processing NAS file systemsUse the include.fs.nas option to bind a management class to NAS file systems <strong>and</strong>to control if Table of Contents in<strong>for</strong>mation is saved <strong>for</strong> the file system backup.336 <strong>IBM</strong> <strong>Tivoli</strong> <strong>Storage</strong> <strong>Manager</strong> <strong>for</strong> <strong>UNIX</strong> <strong>and</strong> <strong>Linux</strong> <strong>Backup</strong>-<strong>Archive</strong> Clients Version 6.1: Installation <strong>and</strong> User’s Guide

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